itkGradientMagnitudeRecursiveGaussianImageFilter.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itkGradientMagnitudeRecursiveGaussianImageFilter.h,v $
  Language:  C++
  Date:      $Date: 2003/09/10 14:28:48 $
  Version:   $Revision: 1.12 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itkGradientMagnitudeRecursiveGaussianImageFilter_h
#define __itkGradientMagnitudeRecursiveGaussianImageFilter_h

#include "itkNthElementImageAdaptor.h"
#include "itkImage.h"
#include "itkPixelTraits.h"
#include "itkRecursiveGaussianImageFilter.h"

namespace itk
{

// NOTE that the ITK_TYPENAME macro has to be used here in lieu 
// of "typename" because VC++ doesn't like the typename keyword 
// on the defaults of template parameters
template <typename TInputImage, 
          typename TOutputImage= TInputImage >
class ITK_EXPORT GradientMagnitudeRecursiveGaussianImageFilter:
    public ImageToImageFilter<TInputImage,TOutputImage>
{
public:
  typedef GradientMagnitudeRecursiveGaussianImageFilter  Self;
  typedef ImageToImageFilter<TInputImage,TOutputImage> Superclass;
  typedef SmartPointer<Self>                   Pointer;
  typedef SmartPointer<const Self>        ConstPointer;
  
  
  typedef TInputImage                                    InputImageType;
  typedef typename InputImageType::PixelType             PixelType;


  itkStaticConstMacro(ImageDimension, unsigned int,
                      TInputImage::ImageDimension);

  typedef typename NumericTraits<PixelType>::RealType      RealType;

  typedef float                                            InternalRealType;
  typedef Image<InternalRealType, 
                itkGetStaticConstMacro(ImageDimension) >   RealImageType;

  typedef RecursiveGaussianImageFilter<
    RealImageType,
    RealImageType
    >    GaussianFilterType;

  typedef RecursiveGaussianImageFilter<
    InputImageType,
    RealImageType
    >    DerivativeFilterType;

  typedef typename GaussianFilterType::Pointer     GaussianFilterPointer;

  typedef typename DerivativeFilterType::Pointer   DerivativeFilterPointer;

  typedef typename TOutputImage::Pointer           OutputImagePointer;

  typedef TOutputImage      OutputImageType;
  typedef typename          OutputImageType::PixelType      OutputPixelType;

  typedef Image< InternalRealType, 
                 itkGetStaticConstMacro(ImageDimension) >      CumulativeImageType;
  typedef typename CumulativeImageType::Pointer                CumulativeImagePointer;

  itkNewMacro(Self);

  void SetSigma( RealType sigma );

  void SetNormalizeAcrossScale( bool normalizeInScaleSpace );
  itkGetMacro( NormalizeAcrossScale, bool );

  virtual void GenerateInputRequestedRegion() throw(InvalidRequestedRegionError);

protected:
  GradientMagnitudeRecursiveGaussianImageFilter();
  virtual ~GradientMagnitudeRecursiveGaussianImageFilter() {};
  void PrintSelf(std::ostream& os, Indent indent) const;
  
  void GenerateData( void );

  // Override since the filter produces the entire dataset
  void EnlargeOutputRequestedRegion(DataObject *output);

private:
  GradientMagnitudeRecursiveGaussianImageFilter(const Self&); //purposely not implemented
  void operator=(const Self&); //purposely not implemented
  
  GaussianFilterPointer         m_SmoothingFilters[ImageDimension-1];
  DerivativeFilterPointer       m_DerivativeFilter;

  CumulativeImagePointer        m_CumulativeImage;

  bool m_NormalizeAcrossScale; 


};

} // end namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkGradientMagnitudeRecursiveGaussianImageFilter.txx"
#endif

#endif

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